From: Nicolas Pitre <nico@cam.org>
Date: Mon, 19 Dec 2005 22:20:51 +0000 (+0000)
Subject: [ARM] 3210/1: add missing memory barrier helper for NPTL support
X-Git-Tag: v2.6.15-rc7~16^2~19^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c612bfd4ed3064fd48a4877a114c8186547367b;p=pandora-kernel.git

[ARM] 3210/1: add missing memory barrier helper for NPTL support

Patch from Nicolas Pitre

Strictly speaking, the NPTL kernel helpers are required for pre ARMv6
only.  They are available on ARMv6+ as well for obvious compatibility
reasons.  However there are cases where extra memory barriers are needed
when using an SMP ARMv6 machine but not on pre-ARMv6.

This patch adds a memory barrier kernel helper that glibc can use as
needed for pre-ARMv6 binaries to be forward compatible with an SMP
kernel on ARMv6, as well as the necessary dmb instructions to the
cmpxchg helper.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Acked-by: Daniel Jacobowitz <dan@codesourcery.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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